2151222876 has 72 divisors (see below), whose sum is σ = 5957039088. Its totient is φ = 649152000.

The previous prime is 2151222863. The next prime is 2151222881. The reversal of 2151222876 is 6782221512.

It is a happy number.

It is a super-2 number, since 2×2151222876² = 9255519724451422752, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2151222876.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84166 + ... + 106706.

It is an arithmetic number, because the mean of its divisors is an integer number (82736654).

Almost surely, 2^2151222876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151222876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2978519544).

2151222876 is an abundant number, since it is smaller than the sum of its proper divisors (3805816212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2151222876 is a wasteful number, since it uses less digits than its factorization.

2151222876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22803 (or 22798 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 2151222876 is about 46381.2772139793. The cubic root of 2151222876 is about 1290.9075351727.

The spelling of 2151222876 in words is "two billion, one hundred fifty-one million, two hundred twenty-two thousand, eight hundred seventy-six".